CODEWITHSUNDEEP
formsasp.net-mvc-3razor
Rubia Gardini
Rubia Gardini

Reputation: 815

MVC3 and Razor - How to place a dynamic value for hidden field?

I'm a beginner about Razor, and sometimes I get stuck with really simple things.

I have this foreach loop:

@foreach (dynamic item in ViewBag.EAList)
{
<li>
    @using (@Html.BeginForm("Duplicate, "Daily"))
    {
        <p>@item.AuthorComment</p>
        @Html.Hidden("EstadoDeAlmaID", @item.EAID)
        @Html.Hidden("PosterID", Session["id"].ToString())
        <input type="submit" value="Send" />
    }
</li>
}

This line:

@Html.Hidden("EstadoDeAlmaID", @item.EAID)

Doesn't work, and I don't know how to make it work, I tried many ways, without @, with (--), with @(--)...

Could someone help me to display the dynamic value in my hidden field? In addition, if someone know about a good Razor samples websites, I would be very thankful.

Upvotes: 2

Views: 13824

Answers (6)

Ian
Ian

Reputation: 334

I have found that when i want to use the view bag data in the HTML Getting back to basics has often worked for me

<input type="hidden" name="Data" id="Data" value="@ViewBag.Data" />

this gave the same result.

Upvotes: 0

Leon Degeling
Leon Degeling

Reputation: 86

I had the same problem, found that a simple cast solved my problem.

@Html.Hidden("id", (string) ViewBag.ebook.isbn)

Upvotes: 6

ThatAintWorking
ThatAintWorking

Reputation: 1360

The simple solution for me was to use ViewData instead of ViewBag. ViewBag is just a dynamic wrapper around ViewData anyway.

@Html.Hidden("ReportID", ViewData["ReportID"])

but I don't know if this will help in your case or not since you are creating dynamic items in your foreach loop.

Upvotes: 0

Paul Tyng
Paul Tyng

Reputation: 7584

To avoid the Extension methods cannot be dynamically dispatched exception, use a model instead of ViewBag so you will not be using dynamic objects (this will avoid all the unnecessary casting in the View and is more in line with MVC style in general):

In your action when you return the view:

return View("ViewName", db.EAList.ToList());

In your view, the first line should be:

@model IEnumerable<EAListItem> //or whatever the type name is

Then just do:

@foreach(var item in Model)

Upvotes: 2

Jerad Rose
Jerad Rose

Reputation: 15503

In Razor, once you are in "C# land", you no longer need to prefix values with @ sign.

This should suffice:

@Html.Hidden("EstadoDeAlmaID", item.EAID)

Check out Scott Gu's article covering the syntax for more help.

Update

And I would also move your <li></li> within your using block, as Razor works better when you wrap HTML blocks inside of a code blocks.

Also, your Html.BeginForm should live outside of your loop.

@using (@Html.BeginForm("Duplicate, "Daily"))
{
    <ul>
        @foreach (? item in ViewBag.EAList)
        {
            <li>
                <p>@item.AuthorComment</p>
                @Html.Hidden("EstadoDeAlmaID", item.EAID)
                @Html.Hidden("PosterID", Session["id"].ToString())
                <input type="submit" value="Send" />
            </li>
        }
    </ul>
}

Where ? in the foreach loop is the type of your items in EAList.

Upvotes: 4

Andrew Barber
Andrew Barber

Reputation: 40149

You got the error, "Extension methods cannot be dynamically dispatched"... therein lies your trouble.

You should declare you loop variable not to be of type dynamic, but of the actual type in the collection. Then remove the @ from the item.EAID call inside the @Html.Hidden() call.

Upvotes: 1

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